For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?
(A) d2T/dZ2 > 0
(B) d2T/dZ2 = 0
(C) d2T/dZ2 < 0
(D) dT/dZ = 0
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